It seems to me that there is a problem in Parallel Computing Toolbox (PCT) with CUDA operation. The problem is that the setting of CUDA device in PCT fails, if CUDA device has been set up earlier within the same process by someone else, therefore, I cannot use PCT functionality, working with CUDA in my application which is also used by CUDA.
I will give you a simple example. Here it is:
loadlibrary('MyComputingLib.dll', 'MyComputingLib.h', 'alias', 'cuda_lib')
An unexpected error occurred during CUDA execution. The CUDA error was: setting the device when a process is active is not allowed.
If the aforementioned actions are performed in the reversed order, the error does not occur (My software works correctly with CUDA device setting). Why cannot MATLAB set up CUDA device, when, starting with CUDA 4.0 version, it is possible to set up CUDA device a multiple number of times within one process?
I think this limitation is the rudiment of what has been left from the old CUDA versions (old derivers), when it was impossible to set up a device a multiple number of times after the process start.
Thank you in advance for your answer.